Malicious PDF — malware analysis report

Static analysis result for SHA-256 407d0c1b7e3776b8…

MALICIOUS

PDF

43.2 KB Created: 2020-04-04 15:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb97c44edaf43b3a487ba69b11f5532e SHA-1: 278f1bf99c11fdf7b00c190775c5a29f88c210df SHA-256: 407d0c1b7e3776b857d483a3b1cd5ad048195716e55291d8322d19da82245913
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier with high confidence and contains numerous external links, characteristic of a link farm or redirection scheme. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, suggesting the document's primary purpose is to host and distribute links to other potentially malicious content. No scripts were extracted, and the document body is largely unreadable, but the presence of multiple unknown URLs points to a malicious intent to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tso-ho.com/uploads/1/3/0/6/130639379/130639379.html#etiqueta+para+alinear+el+texto+en+html
    • http://imacdl.com/uploads/1/3/0/7/130775371/aa459796670a9ff.pdf
    • http://katedumbleton.com/uploads/1/3/0/5/130588527/600b86661cd.pdf
    • http://fitaha.com/uploads/1/3/0/5/130588210/putomozu-jekoma.pdf
    • http://lynseycallahanphotography.com/uploads/1/3/0/7/130776148/sexonuduvimaza-xojiduk-vuvoki.pdf
    • http://cynthiastoneart.com/uploads/1/3/0/2/130288507/varuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000671b.bin
cb37f44ab34f891076ae850f10075a78b66f20eb3af4b070e98deb3d4418a132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 9296 bytes
font_01_sfnt_off000088a6.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A6 16204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.